Keeping Qualities of ‘Stayman’ and ‘Delicious’ Apples Treated with Calcium Chloride, Scald Inhibitors, and other Chemicals1

in Journal of the American Society for Horticultural Science
Authors:
R. E. HardenburgHorticultural Crops Quality Laboratory, Horticultural Science Institute, SEA-AR, U.S. Department of Agriculture, Beltsville, MD 20705

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R. E. AndersonHorticultural Crops Quality Laboratory, Horticultural Science Institute, SEA-AR, U.S. Department of Agriculture, Beltsville, MD 20705

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Abstract

‘Stayman’ apples (Malus domestica Borkh.) dipped in 4% CaC12 were firmer after 5–6 months storage in air at 0°C and developed less senescent breakdown than untreated fruit. Use of the thickener Keltrol with CaC12 or vacuum infiltrating (VI) CaC12 resulted in the firmest fruit after storage and the highest flesh Ca levels. ‘Stayman’ stored 5 or 6 months in CA at 0°C were 1.5 kg firmer than air-stored fruit. Dipping apples in CaC12 prior to CA storage provided little additional benefit. Liquid concentrate formulations of diphenylamine (DPA) and ethoxyquin used alone or in combination with 4% CaC12 gave excellent scald control on ‘Stayman’ stored 5 or 6 months at 0° + 6 days at 20°. However, the same chemicals gave poor scald control for ‘Starkrimson Delicious’ picked early to midseason. The antioxidants BHT and BHA evaluated as postharvest dips at 2,000 ppm were less effective than DPA or ethoxyquin in controlling scald on ‘Stayman’. ‘Delicious’ apples were not significantly firmer after 6 months storage in air at 0°C when dipped in 3% CaC12 alone or with Keltrol, or when CaC12 was VI. When CaC12 was contaminated with Penicillium expansum spores, VI of the solution greatly increased decay of both ‘Delicious’ and ‘Stayman’.

Contributor Notes

Received for publication April 18, 1981.

The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

The authors acknowledge the valued assistance of George A. Brown, Biological Laboratory Technician.

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